People are generally aware of the most common causes of hallucinations, like schizophrenia and a really high fever. But lesser known are the more rare causes; here are six you probably haven't heard about.

Fisherman Catches Giant 3lb 15 inch Goldfish from Michigan Lake

A Michigan fisherman was stunned when he reeled up a wild 3lb 15 inch, giant goldfish, while fishing in Lake St. Clair, a freshwater lake between Michigan and Ontario.

Fisherman Mike Martin had caught the giant goldfish on Jan.11. He said at the time the temperature was beginning to rise and he felt like that day might have been his last ice fishing opportunity for a while.

The seasoned fisherman said that he had cut a circle in the ice and dropped his line into the icy waters as he did many times before. Afterwards he felt the line get tighter and tighter and when he finally pulled his prize up, he saw something he never expected to see.

"It was kind of a shock," Martin told the New York Daily News. "I pulled it up and just kind of stared at it for a minute. I really didn't know what to do with it."

"It was a huge effort to pull it out of the water," he said, according to The Telegraph. "The fish was almost bigger than the hole. I didn't know what to do when I saw it. I just stared at it."

"I tried to find out if it was the world's biggest goldfish," Martin said. "It seems to be the biggest in America, though not the biggest in the world."

"People say I'm evil because I didn't put the fish back in the water. But actually goldfish are an invasive species and if you let them grow in number, they can decimate the fish stock," he said, adding that they can keep growing and getting bigger as they eat everything in their path.

Martin said he had brought the giant goldfish home and placed it in his freezer. He said that he plans to eventually stuff and mount the huge carp on his wall.

"Now it's going to be with me forever," he said, according to The Telegraph.